.header{
	position: fixed;
	top:0;
	left:0;
	display: flex;
	background: #f6f8fa;
	box-shadow: 0 0 1px #b8bbbf;
	height:40px;
	width:100%;
	line-height: 40px;
}
.section{
	/*padding-top:50px;*/
}
/*公用*/
.margin20{
	margin:20px;
}
